4 ideas
Gombrich argues that 'Art' with a capital A is an empty abstraction. What actually exists are particular people making particular objects to meet particular demands: a cave hunter's magic, a patron's altarpiece, a guild commission. Talk about Art in general breeds snobbery and hollow praise, while looking at what a given artist was trying to do lets anyone judge a work on its own terms.
For most of history, artists drew what they knew an object to be, not how it looked from one viewpoint. Egyptian painters showed a head in profile, an eye from the front, and both feet from the inside, each part in its most characteristic view. Depicting appearances from a single point is therefore a late, hard-won achievement that fights against the mind's default of recording essential knowledge.
Gombrich tells the story of art as a chain of artists solving specific technical problems left open by their predecessors, such as foreshortening, perspective, light, and unified composition. Every solution creates new problems. Each gain also carries a loss: the Renaissance won natural perspective but sacrificed the clear, legible order of medieval images. Progress in skill is not the same as progress in art, so styles should be judged by the problem they set themselves.
Caravaggio painted Saint Matthew writing his Gospel for the Contarelli Chapel in Rome around 1602. He showed the saint as a bald, coarse-featured laborer with bare, dirty feet thrust toward the viewer, awkwardly guided by an angel. The church rejected it as indecorous and disrespectful, and he had to paint a more dignified version. Gombrich uses the episode to show how a commitment to unflattering truth collided with expectations of idealized beauty.